--- QtLockedFile-2.4/buildlib/buildlib.pro.orig	2015-02-22 20:04:08.000000000 +0100
+++ QtLockedFile-2.4/buildlib/buildlib.pro	2018-12-31 16:49:24.654850751 +0100
@@ -5,9 +5,12 @@
 include(../src/qtlockedfile.pri)
 TARGET = $$QTLOCKEDFILE_LIBNAME
 DESTDIR = $$QTLOCKEDFILE_LIBDIR
+isEmpty(INSTALL_LIBDIR) {
+  INSTALL_LIBDIR = $$QTLOCKEDFILE_LIBDIR
+}
 win32 {
     DLLDESTDIR = $$[QT_INSTALL_BINS]
     QMAKE_DISTCLEAN += $$[QT_INSTALL_BINS]\\$${QTLOCKEDFILE_LIBNAME}.dll
 }
-target.path = $$DESTDIR
+target.path = $$INSTALL_LIBDIR
 INSTALLS += target